dzhokhar tsarnaev. we've all seen the pictures, as i said. but tonight we're hearing the real story. as if the images of the young man with the backwards baseball hat, feet away from an 8-year-old boy who had no idea he was about to die. as if these images weren't chilling enough, today in a newly filed criminal complaint, law enforcement officials described how 19-year-old dzhokhar tsarnaev calmly placed a bag allegedly containing a homemade bomb made out of a pressure cooker and packed with nails and bbs on the ground in a crowd full of innocent bystanders and simply waited. when the first bomb, allegedly placed by his brother, went off nearby, investigators say they could see everybody in the crowd react with alarm. everybody except tsarnaev, who waited a few seconds, walked away, and allegedly set off the sec bomb. days later he and his older brother tamerlan got in a shoot-out with police. today we learn more about the events leading up to that epic clash. according to the new criminal complaint, the night began with the brothers tsarnae